Converter incorporates low noise buck-boost topology

The device’s 2.5V to 15V input and output voltage range provides a regulated output from inputs above, below or equal to the regulated output. The proprietary, third-generation, buck-boost PWM circuitry ensures low noise and high efficiency while minimizing the size of external components, whilst the device's default 800kHz switching frequency can be synchronized to an external 600KHz to 1.5MHz clock. The combination of tiny externals and a 3 x 4mm DFN or MSOP-16E package provides a compact solution footprint.

Four internal low R_DS(ON) N-channel MOSFETs are incorporated into the device, with the MOSFETs using a single inductor to deliver efficiencies of up to 95%. Quiescent current is lowered to only 49µA by using user-selectable Burst Mode operation, which improves light load efficiency and further extending battery run time. For noise-sensitive applications, Burst Mode operation can be disabled. Other features include soft-start, overvoltage protection, short-circuit protection, thermal shutdown and output disconnect. The LTC3111EDE is available in a 14-lead 3mm x 4mm DFN package and the LTC3111EMSE is offered in a thermally enhanced 16-lead MSOP package.

Pricing starts at $3.50 each and $3.60 each, respectively. Industrial grade versions, the LTC3111IDE and LTC3111IMSE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced starting at $3.85 each and $3.96 each, respectively. High temperature grade versions, the LTC3111HDE and LTC3111HMSE, are guaranteed to operate over the -40°C to 150°C operating junction temperature range and are priced starting at $4.16 each and $4.21 each, respectively. Finally, High reliability grade versions, the LTC3111MPDE and LTC3111MPMSE, are guaranteed to operate over the -55°C to 150°C operating junction temperature range and are priced starting at $10.40 each and $10.69 each, respectively. All pricing is for 1,000 piece quantities and all versions are available from stock.